# 计算矩形面积的函数
def calculateRectangleArea(length, width):
    return length * width

if __name__ == "__main__":
    length1, width1 = 5, 3
    area1 = calculateRectangleArea(length1, width1)
    print(f"第一个矩形的面积是: {area1}")
    length2, width2 = 4, 6
    area2 = calculateRectangleArea(length2, width2)
    print(f"第二个矩形的面积是: {area2}")